Overview: The Sennheiser HD 4.40BT over-ear wireless headphones are ideal for
every day listening while you're on the go. With built-in Bluetooth, you can
pair the headphones to your smart phone or tablet for wireless listening for
hours. The headphones come with a USB charging cable, a straight audio cable,
and a soft storage pouch.
Bluetooth: The HD 4.40BT headphones are compliant with the
Bluetooth 4.0 standard, and are compatible with Bluetooth 1.1 through 4.0
devices with the following profiles: HFP (Hands-Free Profile), HSP (Headset
Profile), AVRCP (Audio Video Remote Control Profile), and A2DP (Advanced Audio
Distribution Profile). In addition, aptX audio coding provides high quality
audio that is comparable to a wired connection. You can pair the headphones with
most Apple and Android Bluetooth devices, including those with NFC (Near Field
Battery: The Bluetooth function is powered by a 3.7-volt
rechargeable battery. The battery charges in
approximately 2 hours using the supplied Micro USB charging cable.
A full charge supplies enough power for 25 hours of wireless listening. The
remaining battery level can be monitored through the flashing LED and voice
prompts. The battery life may also be displayed on the screen of your smartphone
On-board Controls: The HD 4.40BTs have built-in controls on
the right ear cup for power, volume, and music/phone call control. Music
controls include play/pause, skip to next track, skip to previous track, fast
forward, and fast reverse. Phone controls include accept/end a call, reject
call, call on hold, and toggle between 2 calls. Established calls can be
transferred from the headphones to the smartphone by turning off the Bluetooth
connection. Using the Voice Control function of your phone, you can make a call
by speaking a command.
Audio Cable: The included 58" audio cable lets you listen to your
music when the battery is exhausted, or when you cannot, or choose not to, use
Bluetooth. The cable terminates into a slender right-angled 3.5mm plug that is compatible
with most smartphone cases. The cable does not have an in-line remote, and the
on-board controls do not work when the power is off.
- Frequency Response: 18 Hz to 22 kHz
- Impedance: 18 Ω
- Sound Pressure Level (SPL): 113 dB (1 kHz, 1 Vrms)
- Total Harmonic Distortion (THD): <0.5 % (1 kHz, 100 dB SPL)
- Dimensions (Ear Cup): Width 2.99", Height 3.565", Depth 1.878"
- Weight: 7.9 ounces (8.4 oz. with cable)
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